Does Nick have any redeeming qualities by the end of the novel? What does the reader actually know about Nick's character?

Why is Poirot successfully deceived by Nick throughout most of the novel? What does this say about both Poirot and Nick?

When is deception a good thing in the novel and when is it bad?

In the novel, evil is a real and present actuality. How does the novel define evil?

How fair is the novel in presenting the mystery to the reader? How surprising is the ending, and is it satisfying?

Is Poirot's egotism deserved? Are his self-recriminations deserved when things go wrong?

Describe Poirot's moral code. What moral ideals are a high and low priority for Poirot?